Jlitter-shaft for paper-cutting machines



(No Model.)

' E. H. BRIDGMAN.

SLITTER SHAFT FOR PAPER CUTTING MAGHINES.

No. 325,812. Patented Sept. 8, 1885.

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theirs-h dramas PATENT Genres EDWARD H. BRIDGMAN, F PITTSFIELD, MASSACHUSETTS.

ELETTER=SHAFT FOR PAPER CUTTING MACH-ENES.

SPEGIFICATION forming part of Letters Patent No. 325,812, dated September 8, 1885.

Application filed April 17, 1884.

To aZZ whom it may concern.-

Be it known that I, EDWARD H. BRIDG- MAN, of Pittsfield, in the county of Berkshire and State of Massachusetts, have invented new and Improved Slitter-Shafts for Paper-Cutting Machines, of which the following is a full, clear, and exact description.

The object of my invention is to provide a new and improved slitter-shaft for paper-cutting machines and for cutting paper into strips of any desired width.

The invention consists in the construction and arrangement of parts, as will be hereinafter fully described and claimed.

Reference is to be had tothe accompanying drawings, forming a part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure 1 is alongitudinal elevation of apair of my improved slitter-shafts, the upper shaft being shownin longitudinal section. Fig. 2 is an enlarged detail longitudinal section of one end of the upper shaft. Fig. 3 is an end view of one of the cutting-disks. Fig. 4. is an end view of one of the shafts and the wheels for turning it. Fig. 5 is a cross-sectional elevation of the tubular shaft.

Two tubular shafts,A, similar to each other, are mounted to revolve one above the other. Both tubular shafts A are provided with a longitudinal slit extending from end to end, and at each end the shaft A is provided with a. neck or bearing, C, on which the tubular shaft can revolve.

' In each end of the tubular shaft Aa hollow screw, D, is held,which is journaled in ablock or collar, E, held within the shaft a short distance from the end and in an end piece or collar, F, the screw being journaled in such a manner that it can revolve on its longitudinal axis, but cannot move in the direction of its length.

On the outer end of the hollow screw D a hand-wheel, G, is mounted, and is held bya spline or key, G,in such a manner that the screw D must revolve with the said handwheel. A spindle, H,which is screw-threaded throughout its entire length, or part of its length, passes longitudinally through each screw D, and has its outer end journaled in a collar, H, held within the outer end of the screw D, and the inner ends of the two spin- (No model.)

dles H extend to and are j ournaled in a block, I, held in themiddle of the tubular shaft.

011 the outer end of each spindle H a handwheel, K, is held by a spline, K, in such a manner that the said spindle must revolve with the hand-wheel K. The extreme outer end of each spindle H is screw-threaded, and on the said screw-threaded part a jam-nut, L, is held, which is provided with suitable handles for turning it.

Between the end plate, F, and the end of the tube A a dial or disk, M, is held, which has regular subdivisions on its outer surface. On each shaft A a cog-wheeLN, is mounted near the outer end, the said cog-wheels engaging with each other, so that the shafts revolve in opposite directions, and on the end of the bottom shaft A a belt-pulley, 0, is mounted, or other means are provided for transmitting motion to the lower shaft. A series of cutter rings or disks, P, are mounted onthe upper and lower shafts, A, in such a manner that the edges of each pair of cutter disks or rings on the upper and lower shafts face each other and work against each other. The middle cutterdisk P on the upper shaft has a smooth bore, and is held to slide on the upper shaft A. The upper shaft is provided at its middle and on its outer surface with screw-threads a, on which a collar or nut, Q, is screwed, and between the inner edges of the collar Q and the adjoining cutter disk P a spiral spring, R, is coiled around the upper shaft A, the tension of which spring can be adjusted by screwing the nut or collar Q a greater or less distance toward or from the adjoining edge of the cutter P; The other cutters P are provided with wings or arms S, extending through the slot B of the shaft A, and provided on the inner end with a nut, T, through which the the middle cutter-disk P on the lower shaft,

which cutterdisk is also screwed on the screwthreaded part of the bottom shaft. By turn- ;ing the said cutter-disk? it can bejshifteda greater or less distance toward either end of the shaft, and itis locked-in place by the nut Q. Theother cutter-disks P on the lower shaft are mounted loosely on the shaft, and.

between the inner end edge of each cutter-' that is, the end opposite the cutting-edge and a corresponding collar, Q, a spring, R, is coiled around the shaft, which spring acts upon the loose cutterdisk 1?. Each collar Q is provided with a wing, S, extending longitudinally through the slot B of the lower shaft and terminating in its inner end with'a nut, T, through which the spindle H and the screw D are screwed.

The operation is as follows: If the sheet of paper is passed in between the two shafts, the

end cutter disks or blades P trim oil the.

edges of the sheet, and the intermediate cutter disks or blades cut the sheet into strips of the desiredwidth, according to the adjustment of the blades or cutter-disks. .25

The end disks I? ,must also be adjusted according to-the width of the sheet of paper. The cutter-disks on the lower shaft are pressed by springs against the cutterdisks of the upper shaft, but

' the central cutter-disk of the upper shaftis pressed by aspring against the central cutterdi'sk of the lower shaft. By turning the hand: wheels K the, screw-spindles H in the upper shaft are revolved ontheir longitudinal axes,

and those cutter-disks between'the central and end cutter-disks are moved in the direction of the shaft,- and can thus be adjusted according to the desired width of the strips.

The end cutter disks are adjusted by turning the hand-wheels G, which turn the screws D.

The central disk P on the upper shaft can only be adjusted after the central disk on the lower shaft has been adjusted; andjthe adjustment 'of the said central disk]? on the upper shaft isaccomplished by turning thenut Q inone direction or the other. The end. cutter disks or blades on the lower shaft and the'cutter disks or blades between the central cutter disks and .-the-end cutter-disks of *the lower shaft must. be adjusted after the corresponding disks onthe' upper shaft havebeen adjusted. This is accomplished by turning the hand-wheelsG' and K, whereby the. nuts Q- will be movedin the direction of the length of the shalt until'the' edges of the cutter disks or bladesare pressed against the edges of the 7 corresponding cutter disks or blades on the uppershaft." It is immaterial on-which'shaftfthose cutter- .disksacted upon by screws are mounted; but it is evident that of each pair of cutter-disks one disk must be held rigidly after} adjust J ment, and 'the other must be actedn'pon byla p ng, so that the l'eutting edges of the t disks will always be pressed against each other, thus causing an automatic sharpening of the disks, obtained.

The dials M facilitate the adjustment of the cutter 'disks,'as the revolutions of'the handwheels can be regulated according to the subdivisions on the said dials.

of screws passed longitudinally through the as herein shown and described.

i 2. The combination, with a tubular shaft, of cutter disks mounted on the saine, and screws passed longitudinally through the tubular shaft and adapted to move the cutterdisks,

' 3. The combination, with a tubular shaft, of cutter-disks mounted on the same, nuts or ing longitudinally through the shaft and engaging with the nuts, substantially as herein shown and described. I

4L The combination, with a hollow shaft,

lar screwheld within the hollow shaft and adapted to act on one of the cutter-disks, and of a-screw-spindle passed through the tubular screw and adapted to act on the other cutteras herein shown andidescribed.

5. The conibination,,wi th a hollow shalt, of cutter-disks mounted on the same, a tubular screw held within the said hollow shalt and adapted to act on one of the cutter-disks,

. .of a screw-spindle passed through the tubular screw and adapted to act on the other cutterdisk, of handwheels upon the ends of the spindle and the tubular screw, and of a jam-nut on v the 'outer end of the spindle, substantially as herein shown and described.

6. Thelcombination, with a hollow shalt, A, having a ion itudinal slot, B, of .a' block, I, the screw-spin les H, journaled'in theouter ends of the shalts and in the block I, the hollow screw 1), held around the spindle H and in the-shaft A, andof the cutter-disks adapted to be acted. upon by the spindle and tubular screws, substantially as herein shown and described.

"' witnessesi QWILLIA T. 'FILLEY,-

wherebya'clean and sha'. rp cut is I @[WILLI'AM L. ADA

substantially as herein shown and described.

of cutter-disks mounted on the same, a tubu- The jam or look nut L is drawn .taut after I with a hollow Sm ing nuts on the inner en s of the wings, and

shaft and through the said nuts, substantially collars on the said shaft, and of screws extenddisks, and of hand-wheels on the ends of the I spindle and the tubular screw, substantially p v EDWARD rt. B Rl DGMA N. 

